Segregation and Selective Oxidation of Ni Atoms in Pt3Ni(111) in a Low-Pressure Oxygen Environment

Understanding the microscopic mechanism of oxygen interaction with the surfaces of Pt-based alloys is an important issue for applications in various fields such as corrosion and oxygen reaction reduction in fuel cells, for which Pt-based alloys are more efficient catalysts with respect to platinum....

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Bibliographic Details
Published inJournal of physical chemistry. C Vol. 117; no. 51; pp. 27007 - 27011
Main Authors Politano, A, Caputo, M, Goldoni, A, Torelli, P, Chiarello, G
Format Journal Article
LanguageEnglish
Published Columbus, OH American Chemical Society 27.12.2013
Subjects
Applied sciences
Catalysis
Catalysts: preparations and properties
Chemistry
Direct energy conversion and energy accumulation
Electrical engineering. Electrical power engineering
Electrical power engineering
Electrochemical conversion: primary and secondary batteries, fuel cells
Exact sciences and technology
General and physical chemistry
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Electron energy loss spectrum
EEL spectroscopy
Corrosion
High energy
Platinum
Segregation
Low pressure
Oxidation
Microscopic model
Catalyst
Fuel cell
X-ray photoelectron spectra
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Summary:Understanding the microscopic mechanism of oxygen interaction with the surfaces of Pt-based alloys is an important issue for applications in various fields such as corrosion and oxygen reaction reduction in fuel cells, for which Pt-based alloys are more efficient catalysts with respect to platinum. Herein, the interaction of oxygen with Pt3Ni(111) has been studied by X-ray photoemission, X-ray absorption, and high-resolution electron energy loss spectroscopies. We have found that the oxidation of Pt3Ni(111) at 600 K leads to the segregation of Ni atoms to the surface region. The presence of Ni atoms at the Pt3Ni(111) surface allows O2 to dissociate to form NiO x surface species. High-resolution electron energy loss spectroscopy measurements performed on Pt(111), Ni(111), and Pt3Ni(111) directly show that, on the Pt3Ni(111) surface, oxygen binds selectively on Ni sites and, moreover, that the O–Ni bond formed on Pt3Ni is weaker than the O–Pt bond formed on Pt(111).
ISSN:1932-7447
1932-7455
DOI:10.1021/jp409917b